Uncontrolled Search Path Element Affecting nsis package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-NSIS-16286975
- published25 Apr 2026
- disclosed24 Apr 2026
Introduced: 24 Apr 2026
CVE-2026-42171 (opens in a new tab)How to fix?
There is no fixed version for Debian:13 nsis.
NVD Description
Note: Versions mentioned in the description apply only to the upstream nsis package and not the nsis package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
NSIS (Nullsoft Scriptable Install System) 3.06.1 before 3.12 sometimes uses the Low IL temp directory when executing as SYSTEM, allowing local attackers to gain privileges (if they can cause my_GetTempFileName to return 0, as shown in the references).
References
- https://security-tracker.debian.org/tracker/CVE-2026-42171
- https://github.com/NSIS-Dev/nsis/blob/7359413009afd4f0fff472d841fc2f2cc0e0a5f8/Source/exehead/util.c#L475-L484
- https://github.com/NSIS-Dev/nsis/commit/8e6f02205d5f22da6c7855dbfe59b2af667330ca
- https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-gettempfilename
- https://nsis.sourceforge.io/Docs/AppendixF.html#v3.12-cl